Filter screen



Dec. 4, 1934. v Q NORQU|$T 1,982,924

FILTER SCREEN Filed ook. 22. 1932 BY lbf.

ATTORNEY.

Patented Dec. 4, i934 UNITE-D STATES PATENT Aermee Butler Manufacturing Company, Kansas City.

Mo., a corporation of Missouri Application October 22, 1932, Serial No. 839,079 v (CL 21o-181) framestowhichiilteringscreensdandarese somma My invention relates to a filter screen and more particularly to a filter screen having a removable core.

In certain types of filters, particularly those .used for filtering cleaning fluid in connection with dry cleaning processes, a ilne wire'fllter cloth is used. -The filter cloth serves the purpose of forming a means for building up a filter cake. filter cake is formed by -adding a lter aid such as l fullersl earth or. some cellular material to the contaminated or soile'd fluid which is to be illtered. In certain types of filters, anscreen is employed in the form of a hollow meber into which the filtered liquid passes throu'gh the screen. In cer- 'tain types of filters, a pair of wire cloth screens is used. inasmuch as the wire cloth is usually very fine, a coarse supporting screen or other supporting means is usually employed between the filtering or wire cloth screens to hold them apart and to prevent their contacting. After the filter has been in use for sometime, some of the filter aid will find its way into the interscreen space as will sludge and other foreign matter. To clean screen thus contaminated. it is necessary to wash the interscreen space clean. The performing of the washing operation will destroy the lter cake making it necessary to form a new filter cake on the filter screen layers.

One object of my invention is to provide a filter screen construction of the uid screen type enabling it to be readily cleaned.

Another object of my invention is to provide a filter screen construction enabling the cleaning thereof without the destruction of the filter cake.

Other objects of my invention will appear from the following description.

In the accompanying drawing which forms part ofthe instantv specification and which is to be read in conjunction therewith, and in which like refin the various views;

the une 3 3 of Figure 1.

Figure 4 shows an elevation of the removable core oi my filter screen.

A suitable framework composed of side mem bers 1 and 2 which are held in spaced relation by bottom member 3, supports filtering screens 4 and f 5. A pair of top members 6 and 7 complete the This y12 are provided with cured. The frame members are secured to eachf 4 other in any suitable manner such as by welding. The screen members 4 and 5 are secured to the frames in any suitable manner such as by solderf ing. The filtering screens may be of any suitable wire cloth or made out of any suitable material.

One example of a filter cloth which I employ is a y 24 x 100 mesh Monel metal screen.

4Itwillbeobservedascanbereadilyseenby reference to the accompanying drawing that the frame members and the filtering screens form an elongated rectangular compartment. Into this compartment I fit a core member which may -be of any suitable construction.v I may employ a coarse screen such `as a 5% mesh steel wire mining cloth screen suitably electrogalvanized as shown at 8. The upper portion of the core screen 8 terminates in a suspending bar 9 to which the core screen 8 is secured in any suitable manner. The top frame members 6 are provided with a series of bolt holes adapted to permit the passage of bolts therethrough. The core screen supporting member 9 is provided with a plurality o1' openings 10 adapted to be aligned with the openings in the top frame'member 6. The screen supporting member 9 is provided with a suitable handle 11. When assembled as shown in Figure 1, the core screen 8 is housed within the compartment formed by the frame members and the filtering screens 4 and 5. A plurality of bolts 12 securely clamp the supporting member to the top frame members 6 and '1 as can be readily seen by reference to Figure 2. The bottom frame member 3 is provided with a suitable outlet drain 13 through which the lterediluid passes from the filter after having been filtered by passage through the filtering screens 4 and 5 and the filter cake which is built up thereon. The bolts nuts 14 enabling their removal.

It is to be understood that, while I have shownA nuts and bolts as a means for securing the supporting member 9 to the' top.l frame members 6 and '7, that any suitable securing means may be thoroughly'washedisreplaced and theboltsagain secured by nuts 14. I! desired. the nuts'14 may beremoved while theillterscreensarelnplace in the filter. The bolts 12 are then taken out and the cores alone are removed through the means ot handle 11. After cleaning, the cores are replaced andthe bolts and nuts` replaced to form Athe A Y It will be appreciated that I have accomplished the objects o! my invention. I am enabled to" readily clean the illter screens and especially 2. A nlm screen assemhl'eomrlslng m combinaon a frame, a pair of illter screen members supportedbysaidframeinspacedrelaiionto one anotherand forming a hollow illter leal, a passage vthrough one side ot the frame, a unitary core member positioned between said screen members, means t0 permit the t0 be removed lromther'ltersere; a" unit through said passage without disturbing the relation of the illter screen, and an outlet Yfor' the illtered liquid from said inter-screen the interscreen space in an expeditious and conspace venient manner.

I t will be understood that certain featur and sub-combinations are ot utiliw and may be employed without reference to other ieatui'v and sub-combinations. This is contemplated by and lswltmn the scopeoxmyalms. nenn-mer obvious that various changes may be made in details within the scope of my claims without departing from the spirit of my invention. It is,

therefore, to be understood that my invention 3. A filter screen assembly comprising a pair of illter screens. a frame vfor supporting said screens in spaced relation., said trarne having Aa passage through one side thereof, said screens and said frame forming a hollow illter leaf, a lmitary coarse screen core member positioned between the screens and removable through said paage -wmmnt dimming me spaced relation off the illter screens, and an outlet for the from the inter-screen Y 4. A illter screen aemlib'comprising` a pair' filtered liquid o! filter screens', a framejfor screens in spacedrelation, 'said frame bavingra pesage through one side thereof, said ma am mme forming s hollow meer' s single perforated core member positioned between the 'screens and removable as a unit paage without disturbing the spaced o! the filter screens, and an outlet for liqlli. d from the Inter-screenl `spliceO i M llo 

